pacman::p_load(sf, spNetwork, tmap, tidyverse)Inclass_Ex03
network <- st_read(dsn="data/geospatial",
layer="Punggol_St")Reading layer `Punggol_St' from data source
`D:\FuWanqian\ISSS608-VAA\Inclass_Ex\Inclass_Ex03\data\geospatial'
using driver `ESRI Shapefile'
Simple feature collection with 2642 features and 2 fields
Geometry type: LINESTRING
Dimension: XY
Bounding box: xmin: 34038.56 ymin: 40941.11 xmax: 38882.85 ymax: 44801.27
Projected CRS: SVY21 / Singapore TMchildcare <- st_read(dsn="data/geospatial",
layer="Punggol_CC")Reading layer `Punggol_CC' from data source
`D:\FuWanqian\ISSS608-VAA\Inclass_Ex\Inclass_Ex03\data\geospatial'
using driver `ESRI Shapefile'
Simple feature collection with 61 features and 1 field
Geometry type: POINT
Dimension: XYZ
Bounding box: xmin: 34423.98 ymin: 41503.6 xmax: 37619.47 ymax: 44685.77
z_range: zmin: 0 zmax: 0
Projected CRS: SVY21 / Singapore TMchildcare2 = st_zm(childcare, drop = TRUE,
what = "ZM")childcareSimple feature collection with 61 features and 1 field
Geometry type: POINT
Dimension: XYZ
Bounding box: xmin: 34423.98 ymin: 41503.6 xmax: 37619.47 ymax: 44685.77
z_range: zmin: 0 zmax: 0
Projected CRS: SVY21 / Singapore TM
First 10 features:
Name geometry
1 kml_10 POINT Z (36173.81 42550.33 0)
2 kml_99 POINT Z (36479.56 42405.21 0)
3 kml_100 POINT Z (36618.72 41989.13 0)
4 kml_101 POINT Z (36285.37 42261.42 0)
5 kml_122 POINT Z (35414.54 42625.1 0)
6 kml_161 POINT Z (36545.16 42580.09 0)
7 kml_172 POINT Z (35289.44 44083.57 0)
8 kml_188 POINT Z (36520.56 42844.74 0)
9 kml_205 POINT Z (36924.01 41503.6 0)
10 kml_222 POINT Z (37141.76 42326.36 0)networkSimple feature collection with 2642 features and 2 fields
Geometry type: LINESTRING
Dimension: XY
Bounding box: xmin: 34038.56 ymin: 40941.11 xmax: 38882.85 ymax: 44801.27
Projected CRS: SVY21 / Singapore TM
First 10 features:
LINK_ID ST_NAME geometry
1 116130894 PUNGGOL RD LINESTRING (36546.89 44574....
2 116130897 PONGGOL TWENTY-FOURTH AVE LINESTRING (36546.89 44574....
3 116130901 PONGGOL SEVENTEENTH AVE LINESTRING (36012.73 44154....
4 116130902 PONGGOL SEVENTEENTH AVE LINESTRING (36062.81 44197....
5 116130907 PUNGGOL CENTRAL LINESTRING (36131.85 42755....
6 116130908 PUNGGOL RD LINESTRING (36112.93 42752....
7 116130909 PUNGGOL CENTRAL LINESTRING (36127.4 42744.5...
8 116130910 PUNGGOL FLD LINESTRING (35994.98 42428....
9 116130911 PUNGGOL FLD LINESTRING (35984.97 42407....
10 116130912 EDGEFIELD PLNS LINESTRING (36200.87 42219....plot(st_geometry(network))
plot(childcare,add=T,col='red',pch = 19)
plot(network)
plot(childcare,add=T,col='red',pch = 19)
tmap_mode('view')
tm_shape(childcare) +
tm_dots(col="red") +
tm_shape(network) +
tm_lines()tmap_mode('plot')lixels <- lixelize_lines(network,
700,
mindist = 350)samples <- lines_center(lixels) tmap_mode('view')
tm_shape(lixels) +
tm_lines(col = 'blue') +
tm_shape(samples) +
tm_dots() tmap_mode('plot')densities <- nkde(network,
events = childcare2,
w = rep(1, nrow(childcare2)),
samples = samples,
kernel_name = "quartic",
bw = 300,
div= "bw",
method = "simple",
digits = 1,
tol = 1,
grid_shape = c(1,1),
max_depth = 8,
agg = 5,
sparse = TRUE,
verbose = FALSE)densities1 <- nkde(network,
events = childcare,
w = rep(1, nrow(childcare)),
samples = samples,
kernel_name = "quartic",
bw = 300,
div= "bw",
method = "simple")[1] "checking inputs ..."
[1] "prior data preparation ..."
[1] "Splitting the data with the spatial grid ..."
[1] "start calculating the kernel values ..."
[1] " quadra 1/1"
[1] " build graph ..."
[1] " calculating NKDE values ..."
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|======================================================================| 100%[1] "combining the results ..."samples$density <- densities
lixels$density <- densities# rescaling to help the mapping
samples$density <- samples$density*1000
lixels$density <- lixels$density*1000tmap_mode('view')
tm_shape(lixels)+
tm_lines(col="density")+
tm_shape(childcare)+
tm_dots()tmap_mode('plot')kfun_childcare <- kfunctions(network,
childcare,
start = 0,
end = 1000,
step = 50,
width = 50,
nsim = 50,
resolution = 50,
verbose = FALSE,
conf_int = 0.05)
kfun_childcare$plotk